727???'s

[abodybill]

need some help as i have always had a small block's in my cars with 727's or the big block cars were 4-speeds.

so what i like to know how do you tell the diference between the bb or sb 727?

thanks for help.

 

[dusterdon]

The easiest way is to look at the top two holes on the trans or bellhousing. The small block ones are around 8 inches apart and the big block ones are around 6 inches apart. I'm not certain about the sizes, but the big blocks are definitely a couple of inches less. These are the top two mounting holes for the bolts that hole the trans to the block.

 

[70net440]

The way I remember is that big blocks have 4 mounting holes for the dust cover, the small blocks have 2.

 

[Mrmopartech]

Both are correct.Here is the facts,the small block 727 bell housings top bolts are 7 3/4 apart and have 2 inspection cover mounting holes.The big block 727 bell housing bolts are 6 7/16 apart and has 4 inspection cover bolts.The BB727 has a smooth line from the bottom of the tranny to the starter,the SB 727 has a small indentation and it is not a smooth line from the bottom to the starter location.if you have any other tranny question,just ask,Mrmopartech